Except as provided in GPM 602.2, Pre-Award Costs, GPM 602.3, Post-Expiration Costs,or GPM 617, Publication, Documentation and Dissemination, expenditures may not be charged prior to the effective date or subsequent to the expiration date under an NSF cost reimbursement grant.
The ODF file extension is known as OpenDocument Formula which was created by OpenOffice.org Math. It is a file format that saves the text used for creating the formula as well as mathematical equation. Formatted results can be printed to a .pdf file. They are based on the OASIS OpenDocument standard.
The advantage of ODF is that it is not tied to any one office application suite. It is an open standard that any company can implement in their software. OpenOffice uses ODF format as its default document format. Most other word processors, of recent vintage, also have the ability to import and export ODF.